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300-410 Practice Question: Consider the following partial configuration on…
Consider the following partial configuration on router R4:
interface GigabitEthernet0/0 ip address 192.168.2.1 255.255.255.0
ipv6 address 2001:db8:1::1/64 ipv6 ospf 1 area 0 !
interface GigabitEthernet0/1 ip address 10.0.0.1 255.255.255.0
ipv6 address 2001:db8:2::1/64 ipv6 ospf 1 area 0 ! ipv6 router ospf 1 router-id 4.4.4.4
What is the effect of this configuration?
⚠ Common exam trap
Cisco often tests the misconception that OSPFv3 requires an IPv6 router-id, when in fact it uses a 32-bit router-id (like an IPv4 address), and candidates may also incorrectly assume that OSPFv3 needs per-interface router-id configuration or explicit network type statements.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
OSPFv3 will form adjacencies on both interfaces as intended because the router-id is correctly set and OSPFv3 is enabled on each interface.
OSPFv3 (OSPF for IPv6) uses a 32-bit router-id, which can be an IPv4 address (like 4.4.4.4) or any arbitrary 32-bit value, and does not require an IPv6 address. The configuration enables OSPFv3 process 1 under the global 'ipv6 router ospf 1' command, sets the router-id, and activates OSPFv3 on both interfaces with 'ipv6 ospf 1 area 0', allowing adjacencies to form normally on both GigabitEthernet0/0 and GigabitEthernet0/1.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
OSPFv3 will not form adjacencies because the router-id must be an IPv6 address.
Why it's wrong here
OSPFv3 router-id is a 32-bit number in dotted-decimal format, not an IPv6 address. 4.4.4.4 is a valid router-id.
- ✗
OSPFv3 will only form adjacency on GigabitEthernet0/0 because the router-id is not configured under the interface.
Why it's wrong here
The router-id is configured globally under the OSPFv3 process, which is sufficient. It does not need to be per-interface.
- ✓
OSPFv3 will form adjacencies on both interfaces as intended because the router-id is correctly set and OSPFv3 is enabled on each interface.
Why this is correct
The configuration is correct: router-id is set, interfaces are enabled for OSPFv3 in area 0. OSPFv3 will operate normally.
- ✗
OSPFv3 will not form any adjacency because the network type is not specified.
Why it's wrong here
The default network type for Ethernet interfaces is broadcast, which is fine for OSPFv3. No explicit network type is required.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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Senior Network & Security Engineer · founder of Courseiva
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